George Doyle/Thinkstock(KARACHI, Pakistan) -- Pakistan's largest city was the site of a deadly suicide bomb blast on Sunday morning.

The explosion is the latest attack on Pakistan's Shiite minority. The bomber reportedly struck directly outside a Shiite mosque as people were leaving, killing at least 30 people and injuring at least 50 more. According to the BBC, the explosion destroyed several buildings and set others on fire in the residential area.

While Karachi is often named among the most dangerous cities in the world, there had not been a targeted suicide attack in quite a while.

Pakistan's Shiite minority are often the target of attacks from Sunni militant groups, according to the BBC.

Shiites in other areas of Pakistan have already begun to retaliate and form armed militias. Some fear that if similar organizing were to occur in Karachi, the violence could spin out of control.